Service bulletin PI1002B

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
Type	Service bulletin
NHTSA id	10190533
Published by NHTSA	2021-04-21
Manufacturer's number	PI1002B
Manufacturer's date	2015-11-01
NHTSA component	STEERING:GEAR BOX (OTHER THAN RACK AND PINION)

NHTSA's summary

Grease or sealant visible on steering gear - should not be interpreted as leak. Some customers or technicians may comment on seeing grease or sealant on certain locations of the steering gear. The illustrations below include arrows showing the areas on the steering gear that the supplier intentionally applies sealing grease. Any of these locations have the potential of showing visible grease under normal operation.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Steering, Steering gear

Vehicles listed
CHEVROLET SILVERADO 1500	2014, 2015, 2016 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SUBURBAN	2014, 2015, 2016
CHEVROLET TAHOE	2014, 2015, 2016
GMC SIERRA 1500	2014, 2015, 2016 (the catalog's model; the bulletin names a series or trim of it)
GMC YUKON	2014, 2015, 2016

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
PI1002	2018-04-23. Service bulletin. This preliminary informational bulletin provides information for Grease or Sealant Visible on Steering Gear ? Should Not Be Interpreted as Leak Concern.
PIP5140A	2017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician that steps to diagnose and repair vehicles that have a vibration in the 30-40 MPH range. Technician will need to visually inspect the propeller shaft if Pico readings indicate a propeller shaft 1 disturbance. Technician will need to inspect for obvious signs of damage to the propeller shaft, dents, scrapes, and under coating. If the propeller shaft is damaged replace the propeller shaft. If propeller shaft inspection does not indicate any concerns, then record Pico readings with the sensor placed inside the vehicle where the vibration is felt the most. Technician should rotate the propeller shaft 180 degrees at the rear flange and re-evaluate. If propeller shaft re-indexing does not correct concern, see the appropriate section of the latest version of PI1354 and if further assistance is needed see the latest version of PIP5338 prior to contacting General Motors Technical Assistance Center at the number you have been provided for further assistance.
PIT5501D	2017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician on the steps to diagnosis and repair steering that feels loose or has excessive play. This concern could be caused by the Pitman Shaft Over-Center Preload Adjustment becoming misadjusted. Technician will need to replace the steering gear pitman arm shaft with an updated design.
PIT5501	2017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician on the steps to diagnosis and repair steering that feels loose or has excessive play. This concern could be cause by an incorrect Pitman Shaft Over-Center Preload Adjustment. Technician will perform a Steering Gear Pitman Shaft Over-Center Preload Adjustment procedure. Technician will remove the steering gear. The steering gear pitman shaft lash adjuster nut will need to be loosened. Turn the steering gear pitman shaft lash adjuster screw counterclockwise until fully extended. Turn the steering gear pitman shaft lash adjuster screw clockwise one full turn. Rotate the steering gear input shaft from stop to stop using a socket designed for the input shaft geometry, or crows foot with ratchet while counting the number of turns. Starting at either stop, turn the steering gear input shaft back half the total number of turns counted previously. This is the center position of the steering. Ensure the steering gear pitman shaft is centered. The flat on the steering gear input shaft should be facing upward and parallel with the steering gear side cover. Also the master spline on the steering gear pitman shaft is in line with the steering gear pitman shaft lash adjuster screw. Use a torque wrench on the steering gear input shaft to rotate the steering gear input shaft 300 degrees from each side of the center of the input shaft. The input shaft MUST rotate smoothly and must NOT stick or bind. Record the average turning torque from -300 to +300 degree sweep. The average "off center friction" torque must be 0.4 to 1.1 Nm (4 to 10 in lbs). If the torque is outside this range, replace the steering gear assembly. Tighten the steering gear pitman shaft lash adjuster nut to 75-85Nm (55-63 lb ft). Reprogram the Power Steering Control module with the latest calibrations in Tis2Web. Using the scan tool perform a Steering Angle Sensor Centering. Then use the scan tool to perform a Power Steering Pressure S
PIT5213C	2017-08-15. Service bulletin. This Preliminary Information communication advises the technician that the electric steering gear and motor/module kit part numbers 23144655, 23129057, 23185536, 23191364, 23129054, 23144658, 23185542, 23191367, 23129055, 23144657, 23185540, 23191366, 23129056, 23144656, 23185538, 23191365 and 23129059 part restriction through General Motors Product Quality Center has ended. Dealer can now order the parts through the regular Customer Care and Aftersales parts process.
PIT5213B	2017-08-15. Service bulletin. This Preliminary Information communication advises the technician that the electric steering gear and motor/module kit part numbers 23144655, 23129057, 23185536, 23191364, 23129054, 23144658, 23185542, 23191367, 23129055, 23144657, 23185540, 23191366, 23129056, 23144656, 23185538, 23191365, and 23129059 will be placed on restriction through General Motors Product Quality Center. Dealer will need contact General Motors Product Quality Center for further assistance.